Classifications

• • C—CHEMISTRY; METALLURGY
  • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
  • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
  • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
  • C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
  • C23G1/08—Iron or steel
• • C—CHEMISTRY; METALLURGY
  • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
  • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
  • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
  • C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
  • C23G1/08—Iron or steel
  • C23G1/086—Iron or steel solutions containing HF
• • C—CHEMISTRY; METALLURGY
  • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
  • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
  • C23G3/00—Apparatus for cleaning or pickling metallic material
  • C23G3/02—Apparatus for cleaning or pickling metallic material for cleaning wires, strips, filaments continuously
  • C23G3/021—Apparatus for cleaning or pickling metallic material for cleaning wires, strips, filaments continuously by dipping

Definitions

• This invention relates to a process for pickling electrical steel.
• this invention relates to a method for pickling
• Silicon-containing electrical steels are low carbon (from about 0.1% or
• specialty steels typically containing from about 0.5% to about
• oxides on the surface of the steel strip are primarily comprised of iron, silicon, and other associated materials.
• a chemical treatment such as pickling with nitric acid, or, nitric acid in combination with hydrochloric acid and hydrofluoric acid.
• the present invention relates to a process for pickling silicon-
• the pickling process comprises of
• the sprayers are located above the solution
• the spray solution comprises an
• This process may also comprise of a single pickling tank containing
• the sprayers located the strip entry in to the pickling tank.
• the sprayers are
• the spray solution located above the solution contained in the pickling tank and the spray solution comprises an aqueous solution of hydrogen peroxide or an
• Figure 1 Pickling tank arrangement showing electrical steel strip
• Figure 2 Pickling tank arrangement showing electrical steel strip
• Figure 3 Pickling tank arrangement showing electrical steel strip
• the present invention relates to a process for pickling silicon-
• the pickling solution comprises a
• the pickling process of the present invention is designed for pickling
• electrical steel strip in a continuous fashion and comprises at least one
• pickling tank equipped with at least one set of sprayers designed to
• the surface treatment sprayers are comprised of hydrogen peroxide.
• pickling tanks preferably at least three, pickling tanks are employed (see Figures 1-3).
• the sprayers are positioned to treat the steel strip surface in between the pickling treatment in the pickle tanks (see Figures 1 and
• the pickling tanks comprise a mixture of hydrochloric acid and hydrofluoric acid at elevated temperatures.
• the concentration of hydrochloric acid range from about 40 g/1 to about 160 g/1.
• the concentration of hydrochloric acid is from about lOOg/1 to about 120 g/1.
• the concentration of hydrofluoric acid ranges from about 20 g/1 to about 110 g/1.
• the concentration of hydrofluoric acid is from about 30 g/1 to about 50 g/1.
• the solutions in the tanks are maintained at a temperature of about 65°C to about 95°C, with a preferred temperature of about 80°C.
• the concentration of the hydrogen peroxide spray solution is from about 20 g/1 to about 60 g/1. hi another embodiment, the concentration of hydrogen peroxide is about 30 g/1 to about 50 g/1.
• the hydrogen peroxide spray solution is used at ambient temperatures.
• the spray solution comprises an aqueous mixture of hydrogen peroxide and hydrochloric acid, wherein the concentration of hydrogen peroxide is from about 20 g/1 to about 60 g/1 and the concentration of hydrochloric is from about 40 g/1 to about 160 g/1.
• the concentration of hydrogen peroxide is from about 30 g/1 to about 50 g/1 and the concentration of hydrochloric is from about 100 g/1 to about 120 g/1.
• invention is comprised of three pickling tanks containing pickling
• hydrogen peroxide solution sprayers are located in between the
• a scrubber-brush machine is placed after Tank C.
• sprayers are located in between the pickling treatments. In one
• sprayers are located at the exit of Tank A and the
• the sprayers are located at the entrance of the pickling tank.
• the spray solution may
• hydrogen peroxide is in a concentration from about 20 g/1 to about 60 g/1, with a preferred concentration of about 30 g/1 to about 50 g/1.
• hydrochloric acid is in a concentration from about 40 g/1 to about 160
• the sprayers are positioned at the

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• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• General Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Mechanical Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
• Investigating Or Analysing Biological Materials (AREA)

Applications Claiming Priority (3)

Publications (2)

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• 2002
  • 2002-04-09 KR KR1020037013261A patent/KR100654513B1/ko active IP Right Grant
  • 2002-04-09 CN CNB028088301A patent/CN1244718C/zh not_active Expired - Fee Related
  • 2002-04-09 WO PCT/US2002/010962 patent/WO2002081776A1/en active IP Right Grant
  • 2002-04-09 BR BRPI0208748-0A patent/BR0208748B1/pt not_active IP Right Cessation
  • 2002-04-09 DE DE60207225T patent/DE60207225T2/de not_active Expired - Lifetime
  • 2002-04-09 AT AT02763980T patent/ATE309397T1/de active
  • 2002-04-09 CA CA002443687A patent/CA2443687C/en not_active Expired - Fee Related
  • 2002-04-09 MX MXPA03009218A patent/MXPA03009218A/es active IP Right Grant
  • 2002-04-09 EP EP02763980A patent/EP1377692B1/de not_active Expired - Lifetime
  • 2002-04-09 AU AU2002307176A patent/AU2002307176B2/en not_active Ceased
  • 2002-04-09 JP JP2002579535A patent/JP4180925B2/ja not_active Expired - Fee Related
  • 2002-04-09 US US10/119,444 patent/US6599371B2/en not_active Expired - Lifetime
• 2003
  • 2003-10-03 ZA ZA200307744A patent/ZA200307744B/en unknown

Non-Patent Citations (1)

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